Dishwasher having deflecting recesses in the wall thereof



G O www TEl Mcm omal.

RwTl L m95. GAF

RHEA

KHTM

RRmi m F F mi mom IEr DRO Aug. 3l, 1948.

Patented Aug. 31, 1948 l DISHWASHER HAVING DEFLECTING RE- CESSES IN THEWALL THEREOF Fredrik Johan Robert Karistrm, Stockholm, Sweden, assignorto Aktiebolaget Elecktroiux, Stockholm, Sweden, a corporation of Swedenoriginal application April 11, 1940, serial No.

329,092. Divided and this application November 25, 1943, Serial No.511,665.

April 12 1939 My inventionrelates to a dish washer of the type havingmeans for discharging jets of cleaning liquid against the dishes placedin a container. Depending on how the dishes are placed in the container,certain of the jets will not strike the dishes, but will impinge onI awall of the container, and it is an object oi' my invention to redirectsuch jets so that they will impinge on the dishes.

This is accomplished .by providing the inner walls oi the container withsurfaces so formed as to deflect the jets with a minimum loss of energy.In accordance with my invention, the walls are formed with concaverecesses, the bowlshaped surfaces of which may be spherical, o-r may beelongated in the direction of the jets with the end of each recess whichfaces the jet decreasing in depth and width while the opposite end isspherical.

This application is a division of application Serial Number 329.092, ledApril 11, 1940, now issued as Patent Number 2,351,342, dated June 13,1944.

The accompanying drawing shows two embodiments of the invention.

Fig. 1 shows in section a dish washing machine constructed according tothe invention.

Fig. 2 shows part of a wall provided with bowlshaped recessesaccording.to the invention and intended to be fixed to' the inside ofthe cover of the washing-up container, and

Fig. 3 is a section along the line III- III of Fig. 2.

In Fig. 1, 80 designates the container of th dish washing machine forthe reception of washing liquid, and of the dishes or the like to bewashed.A At` the lower part of the container is provided a screen 90 onwhich the dishes are placed, for example in a suitable basket or thelike. Below the screen there is a rotatable spraying member 9| havingopenings 92 through which the washing liquid. as indicated in thedrawing,

' is forced in the form of -jets upwardly through l the screen 90 andagainst the dishes supported thereon. Washing fluid under pressure issupplied to spraying member 9| through a conduit l from a suitable pumpl2. The cover of theeontainer is designated by 8i. On the'sides of thecontainer there are arranged plates 82 which may consist of somemouldable material, such as rubber, synthetic resin, metal or the like.Corresponding plates 83 (Figs. 2 and 3) may be arranged on the undersideof the cover 8|. In

the plates 82 and 83 there are a. number of bowl- In Sweden 3 Claims.4(ol. 134-182) A 2 the container.l These bowl-shaped recesses possessunbroken surfaces. The recesses 84 are composed of a spherical orapproximately spherical part 85, said part being the upper one in theembodiment shown, and of a more elongated part 86 which passes into thesurface of the plate 82 and the bottom portion of which may, if desired,be plane. The extension and longitudinal section of the bowls areclearly seen from Fig. 1. The left-hand part of Fig. 1 also shows howthose jets which donot strike the dishes strike instead the bowls 84 andare deflected by them, with the result that the dishes are struck byjets not only from below but'also from the side and obliquely fromabove. The part 86 of the recesses 84 tapering in section downwardly hasfor its object to allow the surface of the bowl to gradually change thedirection of the jets and also makes it possible for the maximum numberof jets to strike the bowl-shaped surfaces. As shown in Fig. 1, theshape of each recess 84 in the side walls is such that the intersectionof the surface of the recess with a plane normal to the wall andparallel to the stream which strikes it is a straight line along thelower portion of the recess, that is the portion adjacent the sprayingmember, and is an arc along the remainder of the recess, with the linebeing tangent to the arc. It is important that the edge of the portionof each recess where the re-directed jet leaves the recess, that is theupper part (Fig. 1) of the bounding edge of each recess, should besharp, for the purpose of preventing the jets from being split up byadhesion, in which case they would lose their coherence and therebytheir washing power.

The bowl-shaped recesses 8,1 according to Figs.

`2 and 3 have wholly spherical or approximately spherical surfaces,because they lack the extension 86, to be found in the recesses 84according to Fig. 1. The bowl-shaped recesses 81 are, in fact, intendedto change the direction of the jets passing between the dishes, comingfrom below and striking the cover almost at right angles, said jetsbeing forthis purpose deflected in an almost opposite direction, thatis, so that they pass downwardly.

If desired, the recesses 84 and 81 may be pressed directly into the sidewalls of the container 8D or the underside of the cover 8|, even thoughsaid parts should consist of for example, sheet metal. It is notnecessary that the bounding walls of the container should themselves beconstructed with recesses according to the invention, since saidrecesses may also be arranged in, other parts located nearest to thedishes,

'Whatl claim is:

1. In av dishwashing apparatus, a receptacle, a sprayer member withinsaid receptacle, and means for supplying water under pressure to saidmember to thereby produce a plurality of high velocity streams, aninterior wall of said receptacle- 'being formed with a multitude ofclosely spaced concave bowl-shaped recesses, the surface of each recessintersecting the surface of the wall along a single line closed onitself, said recesses being small enough so that each recess will beim-pinged by notmore than one of said streams which will be redirectedtowards the interior of the receptacle by the bowl-shaped concavesurface of the recess with a minimum of lateral spreading of the stream.

2. In a dishwashing apparatus, a receptacle,

a sprayer member within said receptacle, and means for supplying waterunder pressure to said member to thereby produce a plurality of highvelocity streams, an interior wall of said receptacle being formed witha multitude of closely spaced concave bowl-shaped recesses, the surfaceof each recess intersecting the surface of the wall along a single lineclosed on itself, said recesses being small enough so that each recesswill be implnged by not more than one of said streams which will beredirected towards the interior of the receptacle by the bowl-shapedconcave surface of the recess with a minimum of lateral spreading of thestream, each of 4saidv recesses being elongated in the direction of thestream which impinges it.

3. In a dishwashing apparatus, a receptacle, a sprayer member withinsaid receptacle, and means for supplying water under pressure to saidmember to thereby produce a plurality of high velocity streams, aninterior wall of said receptacle being formed with a multitude ofclosely which impinges it and having a shape such that `spaced concavebowl-shaped recesses, "the surface of each recess intersecting thesurface of the wall along a single line closed on itself, said recessesbeing small enough so that each recess will be impinged by not more thanone of said streams which will be redirected towards the interior of thereceptacle by thebowl-shaped concave surface of the recess with aminimumof lateral spreading of the stream, each of said recesses beingelongated in the direction of the stream the intersection of the surfaceof the recess with a plane normal to the wall and parallel to the streamis a straight line along the portion of the recess adjacent the sprayingmember and is an arc along the remainder of the recess, said line beingtangent to said arc.

FREDRIK JOHAN ROBERT KARLSTRM.

REFERENCES CITED 4The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Certificate of Correction Patent No. 2,448,490.August 31, 1948 FREDERICK JOHAN ROBERT KARLSTRM It is hereby certifiedthat name of the assignee in the above numbered patent was erroneouslydescribed and specified as Aktiebolaget Elecktrolux Whereas said nameshould have been described and specified as Aktz'ebolaget Elektrolux, asshown by the record of assignments in this Office; and that the saidLetters Patent should be read with this correction therein that the samemay conform to the record of the case in the Patent Ofice.

Signed and sealed this 29th day of March, A. D. 1949.

THOMAS F. MURPHY,

Assistant 'ommssz'oner of Patents.

